[21/many] acrypto: simple_lb.c

[Evgeniy Polyakov]

--- /tmp/empty/simple_lb.c	1970-01-01 03:00:00.000000000 +0300
+++ ./acrypto/simple_lb.c	2005-03-07 20:35:36.000000000 +0300
@@ -0,0 +1,88 @@
+/*
+ * 	simple_lb.c
+ *
+ * Copyright (c) 2004 Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
+ * 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+#include "crypto_lb.h"
+
+static void simple_lb_rehash(struct crypto_lb *);
+static struct crypto_device *simple_lb_find_device(struct crypto_lb *,
+						   struct crypto_session_initializer *,
+						   struct crypto_data *);
+
+struct crypto_lb simple_lb = {
+	.name = "simple_lb",
+	.rehash = simple_lb_rehash,
+	.find_device = simple_lb_find_device
+};
+
+static void simple_lb_rehash(struct crypto_lb *lb)
+{
+}
+
+static struct crypto_device *simple_lb_find_device(struct crypto_lb *lb,
+						   struct crypto_session_initializer *ci,
+						   struct crypto_data *data)
+{
+	struct crypto_device *dev, *__dev;
+	int min = 0x7ffffff;
+
+	__dev = NULL;
+	list_for_each_entry(dev, lb->crypto_device_list, cdev_entry) {
+		if (device_broken(dev))
+			continue;
+		if (!match_initializer(dev, ci))
+			continue;
+
+		if (atomic_read(&dev->refcnt) < min) {
+			min = atomic_read(&dev->refcnt);
+			__dev = dev;
+		}
+	}
+
+	return __dev;
+}
+
+int __devinit simple_lb_init(void)
+{
+	dprintk(KERN_INFO "Registering simple crypto load balancer.\n");
+
+	return crypto_lb_register(&simple_lb, 1, 1);
+}
+
+void __devexit simple_lb_fini(void)
+{
+	dprintk(KERN_INFO "Unregistering simple crypto load balancer.\n");
+
+	crypto_lb_unregister(&simple_lb);
+}
+
+module_init(simple_lb_init);
+module_exit(simple_lb_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Evgeniy Polyakov <johnpol@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Simple crypto load balancer.");

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